The luteal phase (or secretory phase) is the latter phase of the menstrual cycle (in humans and a few other animals) or the estrous cycle (in other placental mammals). It begins with the formation of the corpus luteum and ends in either pregnancy or luteolysis. The main hormone associated with this stage is progesterone, which is significantly higher during the luteal phase.
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2

Cycle day:
Cycle day 24 would be in the late luteal phase if your cycle. The follicular phase is before ovulation, and the luteal phase is after. In a normal 28 day cycle, cycle day 1 is the first day of your period. Ovulation occurs on cycle day 14. If you don't get pregnant, your period will come on cycle day 28. So. Anything after cycle day 14 and you period is your luteal phase
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5

No, but...:
These luteal of your menstrual cycle is generally 13-15 days & can be calculated from the first day of your menstrual period back. It is the most consistent part of your cycle. This is may not be as consistent in young woman yourself, dep on how long you've had u'r period. The menstrual & proliferative follicular) phases of the cycle are the ones that tend to be irregular when there is an issue.
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7

Defect or no defect:
Many don't believe that luteal phase defect actually exists. Usually people with a diagnosed luteal phase defect actually have problem with growing a healthy egg. Remember the egg and its associated cells determine the length of the luteal phase.
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8

Keep body weigh down:
Although prematuredeath of the dominant follicle followed by replacement or follicular suppression are possible causes, the most common reason for long follicular phases in women is prolongation of the time from recruitment to emergence of the dominant follicle. This is most commonly seen in PCOS. You are ovulating and menstruating, so that is good. There is not much for you to do.
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9

Lab results:
According to the isolated lab result without knowing any of your clinical history this is a normal result. In order to know if this is a normal result for you in your situation you will have to ask the doctor who ordered the test.
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11

DSPS:
Simply put, dsps is when a person can fall asleep and stay asleep normally (ie, insomnia is not an issue) but they habitually fall asleep late at night, such as 2-3 am. They also sleep a normal number of hours. Advanced sleep phase disorder is the exact same thing but the person sleeps early such as 7-8 pm. Think college student and elderly person respectively.
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13

Teenage sleep:
This is commonly found in teenagers. It occurs when a person stays up later and later and sleeps later and later. Thus shifting their sleep wake cycle so that they sleep more in the day and stay up more at night, it can be treated with chronotherapy - walking the person around the clock to the correct times.
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18

Non-proven therapy:
Vitamin therapy for luteal phase defect is unproven; i know of no convincing evidence that it has nay impact on lpd at all. Therefore, there's no recommendation for 'how much' to take. You might be aware that experts do not even agree on the impact of lpd and whether it needs to be treated at all.
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20

LPD:
No one completely understands lpd, and its role is very much less important than believed 20 years ago. A theory is inadequate luteal phase comes from abnormal or 'weak' ovulation: thus, if Clomid (clomiphene) improves ovulation it 'might' fix lpd too. The importance of lpd is usually in pregnancy loss, and Progesterone supplementation not Clomid (clomiphene) is the main treatment.
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